the state of being decayed or destroyed / the process of becoming dilapidated / The act of falling or tumbling down / to spoil or destroy; to make something useless. The same word also means an old building that is falling down / the physical destruction or disintegration of something or the state of disintegrating or being destroyed.,

Usage

⇒ Her ancestral house has fallen into ruin through sheer neglect The ruins of the golconda fort are still there ⇒ a large white house falling into gentle ruin ⇒ his business deals brought him to the brink of ruin ⇒ the end of the world